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Effect of tympanic membrane perforation on middle-ear sound transmission

Published online by Cambridge University Press:  22 May 2009

Y Matsuda ,
T Kurita ,
Y Ueda ,
S Ito  and
T Nakashima
Y Matsuda*
Affiliation:
Department of Otolaryngology-Head and Neck Surgery, Kurume University School of Medicine, Kurume, Japan.
T Kurita
Affiliation:
Department of Otolaryngology-Head and Neck Surgery, Kurume University School of Medicine, Kurume, Japan.
Y Ueda
Affiliation:
Department of Otolaryngology-Head and Neck Surgery, Kurume University School of Medicine, Kurume, Japan.
S Ito
Affiliation:
Department of Otolaryngology-Head and Neck Surgery, Kurume University School of Medicine, Kurume, Japan.
T Nakashima
Affiliation:
Department of Otolaryngology-Head and Neck Surgery, Kurume University School of Medicine, Kurume, Japan.
*
Address for correspondence: Dr Yoichi Matsuda, Department of Otolaryngology-Head and Neck Surgery, Kurume University School of Medicine, 67 Asahi-machi, Kurume 830-0011, Japan. Fax: +81 942 37 1200 E-mail: matsu@med.kurume-u.ac.jp
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Abstract

Tympanic membrane perforation causes a sound conduction disturbance, and the size of this conduction disturbance is proportional to the perforation area. However, precise evaluation of perforation size is difficult, and there are few detailed reports addressing this issue. Furthermore, such evaluation becomes more difficult for irregularly shaped perforations. This study conducted a quantitative evaluation of tympanic membrane perforations, using image analysis equipment.

A significant correlation was found between the degree of sound conduction disturbance and the perforation area; this correlation was greater at low frequencies following a traumatic perforation. The conductive disturbance associated with chronic otitis media was significantly greater at low frequencies. Circular perforations caused only minor conduction disturbance. Perforations in the anteroinferior quadrant were associated with greater conduction disturbance. Traumatic spindle-shaped perforations and malleolar perforations were associated with greater conduction disturbance.

Keywords

Tympanic Membrane PerforationTraumatic PerforationChronic Otitis MediaConductive Hearing Loss
Type
Main Articles
Information
The Journal of Laryngology & Otology , Volume 123 , Supplement S31 , May 2009 , pp. 81 - 89
Copyright
Copyright © JLO (1984) Limited 2009

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